public class Example4_19 {
       	public static void main(String args[]) {
		Student zhang=new Student(); 
		Student geng=new Student();  
		zhang.setAge(23); 
		System.out.println("zhang的年龄："+zhang.getAge()); 
		geng.setAge(25);	
	        System.out.println("geng的年龄："+geng.getAge());  
 	}
}
						       

